Taking birth control pills for 9 days without retreating bleeding may be a normal situation, or it may be related to pregnancy. 1. Normal situation: If the time to take the pill is after ovulation, the body’s ovaries have begun to secrete progesterone, at the same time the thickness of the uterine lining is relatively thin, so after taking the pill, there will not be this estrogen, progesterone obvious withdrawal bleeding. 2. Pregnancy: The contraceptive effect of oral contraceptives at the current stage can not reach 100%, so there is still the possibility of pregnancy after taking oral contraceptives, it is recommended that women who still do not have retreating bleeding after 9 days of taking the pill should go to the hospital in time for a relevant examination to determine whether they are pregnant or not, and then decide on further treatment. Therefore, if a woman does not have withdrawal bleeding after taking the pill for 9 days, she should first consider whether she is ovulating or not. The first thing to consider is whether the pill was taken after ovulation. If so, it is still recommended to go to the hospital for further examination of ultrasound and blood HCG (human chorionic gonadotropin) to clarify whether she is in a state of pregnancy.